The fractal increment of dynamic subsidence of the ground surface point induced by mining 采礦引起地表點動態(tài)下沉的分形增長規(guī)律研究
The following is a simple introduction to the thesis ' s main content : 1 . error analysis in surface fea variation of errors against the normal angular of surface points is produced about surface fea . a angular is selected according to error of surface fea 下面簡要介紹本文研究的主要內(nèi)容: ( 1 )曲面有限元計算的誤差分析在對曲面的有限元計算產(chǎn)生的誤差分析中,得出了曲面有限元計算的誤差和曲面上相鄰兩點法線夾角的關(guān)系。
Based on the research of the characteristics of piezoelectric ceramic , this paper presents the analysis of the movement of the stator surface points and work principle of motor . this paper describes a theory about the influence of the ultrasonic vibration on the frictional properties of ultrosonic dring , and finds that the horizontal vibration produces friction driving force and vertical vibration affects horizontal driving effect 并且對行波型超聲波電動機的減摩現(xiàn)象進行了研究,發(fā)現(xiàn)在接觸區(qū)定子表面上一點的水平振動產(chǎn)生摩擦驅(qū)動力,垂直振動只起影響水平驅(qū)動效果的作用,得出垂直方向超聲振動具有減振作用是引起超聲驅(qū)動動摩擦系數(shù)降低的原因。